When discussing e-liquid composition, the terms propylene glycol (PG) and vegetable glycerin (VG) appear frequently. These two base ingredients form the foundation of many e-liquid formulations and influence characteristics such as flavour expression, vapour production and overall consistency. Understanding their individual roles is particularly useful when researching the VG PG ratio.

PG is especially relevant to flavour delivery because of its properties as a carrier for flavour concentrates. The amount of PG present in an e-liquid can influence how clearly flavour notes are perceived, how the liquid behaves during heating and how the resulting aerosol feels.

What Is PG in E-Liquid?

Propylene glycol, commonly abbreviated as PG, is a clear, relatively thin liquid used as a base ingredient in many e-liquid formulations. It has a relatively neutral taste and is capable of carrying flavour compounds effectively.

E-liquid manufacturers can combine PG with VG in different proportions to create specific formulation characteristics. The resulting VG PG ratio describes the relative amounts of these two base liquids.

For example, a formulation described as 50/50 generally contains approximately equal proportions of VG and PG. Other formulations may contain a higher proportion of either ingredient depending on the intended characteristics of the e-liquid.

Why Does PG Help Carry Flavour?

One of PG’s key characteristics is its ability to act as a carrier for flavour compounds. Flavour concentrates are distributed throughout the liquid base, allowing the formulation to deliver a consistent flavour profile when heated.

This property makes PG particularly important for formulations where flavour clarity is a priority. Different flavour ingredients can have different chemical characteristics, and the base liquid influences how those ingredients are distributed within the finished e-liquid.

The VG PG ratio therefore has a direct connection to how flavour-focused an e-liquid formulation may be designed.

How Does PG Influence Flavour Perception?

Flavour perception involves more than the flavour concentrate itself. The aerosol’s characteristics, temperature, concentration and interaction with the senses all contribute to the overall experience.

PG produces a relatively light aerosol compared with VG, allowing flavour characteristics to remain prominent. A formulation containing a higher proportion of PG may provide a more distinct perception of individual flavour notes.

This is one reason PG has traditionally been associated with flavour-focused e-liquid formulations.

What Is the Relationship Between PG and VG?

VG and PG serve different functions within an e-liquid base. VG, or vegetable glycerin, is a thicker liquid commonly associated with vapour production and a smoother mouthfeel. PG has a thinner consistency and is widely used for flavour carrying.

The VG PG ratio combines these characteristics in different proportions.

A balanced 50/50 formulation provides a middle ground between the properties associated with both ingredients. Higher-PG formulations place greater emphasis on PG’s thinner consistency and flavour-carrying characteristics, while higher-VG formulations place greater emphasis on VG’s characteristics.

The appropriate formulation depends on the intended product design and hardware being used.

Does PG Affect Throat Sensation?

PG is also associated with a more noticeable throat sensation compared with VG. This characteristic is sometimes referred to as “throat hit” within vaping terminology.

The sensation can vary according to PG concentration, nicotine content, flavour ingredients, device power and individual sensitivity.

For consumers researching the VG PG ratio, this means the ratio can provide useful information about more than flavour alone. It can also offer an indication of how the e-liquid may feel during use.

How Does PG Affect E-Liquid Consistency?

PG has a thinner viscosity than VG. This difference is important because e-liquid viscosity influences how easily the liquid moves through the device’s wicking system.

The VG PG ratio therefore needs to be considered in relation to the hardware. Different coils and wicking systems are designed around different liquid characteristics.

A balanced formulation may provide a different flow behaviour from an e-liquid containing a high proportion of VG. Manufacturers formulate liquids with these physical properties in mind.

Can PG Influence Flavour Clarity?

PG’s role as a flavour carrier contributes to the clarity of flavour profiles. When flavour concentrates are evenly distributed through the base, different components of a flavour formulation can be represented within the aerosol.

For complex flavour profiles, this can be particularly relevant. Fruit, mint, dessert, beverage and tobacco-inspired formulations may contain multiple flavour components, each contributing to the overall profile.

The base formulation helps determine how these components are delivered, making the VG PG ratio an important consideration when evaluating an e-liquid’s intended characteristics.

How Does the VG PG Ratio Affect Different E-Liquids?

Different e-liquid categories may use different ratios depending on their intended application.

A 50/50 VG PG ratio is commonly associated with balanced formulations and is frequently used with pod-style devices. Higher-VG formulations are often designed around hardware capable of handling thicker e-liquid and producing larger volumes of vapour.

Higher-PG formulations place more emphasis on PG’s fluidity and flavour-carrying properties.

These ratios are not simply flavour measurements. They represent the formulation’s underlying balance between two base liquids with different physical characteristics.

Why Should Hardware Be Considered?

E-liquid and hardware work together. Coil design, resistance, power output, airflow and wicking characteristics can all affect how a particular formulation performs.

An e-liquid with a specific VG PG ratio should therefore be considered in the context of the device for which it is intended. Manufacturers often provide recommended specifications to help users understand appropriate applications.

This is especially relevant when switching between different types of vape hardware because the same e-liquid formulation may behave differently depending on the coil and wicking system.

What Should Consumers Look for on an E-Liquid Label?

When researching e-liquids, useful information can include the VG PG ratio, nicotine strength where applicable, flavour description, bottle size and manufacturer information.

The VG PG ratio can help explain the expected physical characteristics of the liquid. A formulation with more PG generally has a thinner consistency and stronger emphasis on PG’s flavour-carrying properties, while a formulation with more VG generally has a thicker consistency.

Understanding this information allows consumers to make more informed decisions based on formulation and hardware compatibility.

About ABC Vape

ABC Vape is a Canadian online vape shop offering disposable vapes, vape pods, e-liquids, e-juices and vaping accessories. Its product selection includes brands such as Allo, STLTH, Elfbar, Flavor Beast, Insta Bar, Linvo, Orbito, Oxbar and Vice. ABC Vape serves Canadian customers through its online store and offers free delivery on orders above $100.

Conclusion

PG plays an important role in e-liquid formulation because of its ability to carry flavour compounds and its relatively thin consistency. Its characteristics can influence flavour perception, throat sensation and how an e-liquid interacts with a device’s wicking system.

For anyone researching the VG PG ratio, understanding the separate roles of PG and VG provides useful context when evaluating different e-liquids. The ratio describes the balance between two base ingredients, while factors such as flavour formulation, hardware and individual preferences also contribute to the overall characteristics of an e-liquid.